Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/211
It looks as though the displayed items depend on what the search box shows
as well as the mode.
The list name is only shown if the search box shows a wild-card list. It
also looks as though the wildcard list from the URL is not propagated into the
search box.
Note: the URL above no longer works because it uses a relative time.
Replace lte=1M with lte=nM as needed.
Also in flat mode it looks as if the list name is shown on the first e-mail
of a thread only, and not when the Default theme is used - in which case the
sender only is displayed. Whereas for other modes the listname is shown in all
themes (if the search box is wildcarded)
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